Schur's Representation Lemma
If 
on 
and 
on 
are irreducible representations and 
is a linear map such that
for all 
and group 
, then 
or 
is invertible. Furthermore, if 
, then isa Scalar.
References
Knapp, A. W. ``Group Representations and Harmonic Analysis, Part II.'' Not. Amer. Math. Soc. 43, 537-549, 1996.
- Sharpe Ratio
- Sharpe's Differential Equation
- Sheaf (Geometry)
- Sheaf (Topology)
- Shear
- Shear Matrix
- Shephard's Problem
- Sheppard's Correction
- Sherman-Morrison Formula
- Shi
- Shift
- Shift Property
- Shimura-Taniyama Conjecture
- Shimura-Taniyama-Weil Conjecture
- Shoemaker's Knife
- Shoe Surface
- Shortening
- Shuffle
- Siamese Dodecahedron
- Siamese Method
- Sibling
- Sicherman Dice
- Sici Spiral
- Side
- Sidon Sequence